CN109768572B - Electric power information digital-analog hybrid simulation platform oriented to photovoltaic direct-current boosting and collecting system - Google Patents
Electric power information digital-analog hybrid simulation platform oriented to photovoltaic direct-current boosting and collecting system Download PDFInfo
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Abstract
The invention discloses a power information digital-analog hybrid simulation platform facing a photovoltaic direct-current boosting and collecting system, which comprises a digital-analog hybrid simulation part and a power information simulation part, accurately simulates the characteristics of the photovoltaic direct-current boosting and collecting system, tests the performance of real physical equipment, researches the influence of the real equipment on the operation of a power system, simulates a real communication environment, analyzes the operation working conditions of the power system under different communication environments, researches the influence of the communication conditions on the power system, overcomes the limitation of a real object system by practical conditions, and improves the simulation capability of the power information physical system.
Description
Technical Field
The invention belongs to the technical field of power system simulation, and particularly relates to a photovoltaic direct-current boosting and collecting system-oriented power information digital-analog hybrid simulation platform and method.
Background
With the continuous expansion of the scale of the photovoltaic power station, the problems of harmonic resonance and reactive power transmission of the traditional alternating current collecting system are increasingly prominent, and the sending capacity of the photovoltaic power station is severely restricted, so that the photovoltaic power station adopts direct current boosting, collecting and sending to become an important direction for future construction.
At present, the existing platform for photovoltaic power stations to adopt direct-current boosting collection and sending is single, the capacity of the existing power information simulation platform for simulating real communication environment is insufficient, various real communication scenes cannot be completely reproduced, the existing digital-analog hybrid simulation platform does not have pertinence, the grid-connected inverter characteristic of the photovoltaic direct-current boosting collection station cannot be accurately reflected, in addition, the existing platform for photovoltaic power stations to adopt direct-current boosting collection and sending cannot integrate the power information simulation function and the digital-analog hybrid simulation function, the accuracy and the practicability are greatly reduced, therefore, the problems of changeable topological structure and complex control and protection of a photovoltaic system direct-current collection access system are urgently needed, and a set of complete platform is needed to provide technical support for developing technical research and engineering practice of the photovoltaic direct-current boosting collection access system.
Disclosure of Invention
The invention provides a photovoltaic direct-current boosting and collecting system-oriented power information digital-analog hybrid simulation platform and a method, aiming at the problems in the prior art, and the platform comprises a digital-analog hybrid simulation part and a power information simulation part, accurately simulates the characteristics of a photovoltaic direct-current boosting and collecting system, tests the performance of real physical equipment, researches the influence of the real equipment on the operation of a power system, simulates a real communication environment, analyzes the operation working conditions of the power system under different communication environments, researches the influence of the communication conditions on the power system, overcomes the limitation of a real object system by the practical conditions, and improves the simulation capability of the power information physical system.
In order to achieve the purpose, the invention adopts the technical scheme that: the power information digital-analog hybrid simulation platform for the photovoltaic direct-current boosting and collecting system comprises a digital-analog hybrid simulation part and a power information simulation part;
the digital-analog hybrid simulation part consists of a power system simulator, a power hardware circuit and a power amplifier, wherein the power system simulator is connected to the power amplifier, the power amplifier is connected with the power hardware circuit, and the power system simulator, the power hardware circuit and the power amplifier are all electrically connected;
the power information simulation part consists of a power system simulator, a communication system simulator and an embedded controller, the embedded controller is connected with the communication system simulator, and data are transmitted among the power system simulator, the communication system simulator and the embedded controller through Ethernet;
the system comprises a power system simulator, an upper computer of the power system simulator and a communication system simulator, wherein the power system simulator, the upper computer of the power system simulator and the communication system simulator are connected to a switch to form a local area network;
the digital-analog hybrid simulation part combines digital simulation of the power system simulator with physical simulation of actual equipment and circuits to form a closed-loop test system for detecting the service performance conditions of the actual equipment and circuits;
The electric power information simulation part carries out coupling simulation on electric power system information flow data and electric power flow data, and influences of communication conditions and control processes on the system are reflected.
As an improvement of the invention, the power hardware circuit comprises a DC-AC converter, a filter, a voltage regulator and a direct current load;
the power system simulator comprises a photovoltaic array model, a line model, an inverter model, a transformer model, a communication module and an analog input/output module, wherein photovoltaic stations are converged and connected to a direct-current bus in a series-parallel connection mode;
the model in the communication system simulator comprises a photovoltaic station communication workstation model, a communication interface model, a router model and a line model;
the embedded controller comprises a data acquisition unit, a state monitoring unit and a control algorithm unit.
In order to achieve the purpose, the invention also adopts the technical scheme that: the power information digital-analog hybrid simulation method for the photovoltaic direct-current boosting collection system is characterized in that digital signals obtained by a power system simulator are connected to a real grid-connected inverter and a filter circuit through a power amplifier and finally connected to an alternating-current power grid, and digital simulation of the power system simulator is combined with physical simulation of actual equipment and circuits to form a closed-loop test system;
The power information hybrid simulation step is to simulate the communication condition of an actual power system based on a communication system simulator, simulate an actual photovoltaic station monitoring center by using an embedded controller, access the monitoring center into a power information simulation platform in a ring form by using hardware, simulate the communication and station level control process of a photovoltaic station during actual operation and perform coupling simulation on power system information flow data and power flow data;
the two steps are performed simultaneously.
As an improvement of the present invention, the digital-analog hybrid simulation step further includes:
s1, the power system simulator simulates a power system model in real time, the photovoltaic stations are connected in a series-parallel connection mode, and the system collects voltage information and transmits analog quantity to the power amplifier through electrical connection;
s2, the power amplifier amplifies the collected voltage signal, connects to the power hardware circuit, and feeds the current signal back to the power system simulator in analog form;
s3, connecting the output voltage of the power amplifier to an alternating current network through a DC-AC two-level converter to realize photovoltaic direct current boosting and grid connection, and simultaneously feeding back a voltage and current signal sampling value after the filter circuit to the power system simulator;
And S4, the power system simulator generates a PWM control signal according to the voltage and current sampling signal and outputs the PWM control signal to the DC-AC two-level converter.
As another improvement of the present invention, the power information hybrid simulation step further includes:
s1', the power system simulator simulates the power system model in real time, the communication module collects the state information of the photovoltaic station, packages the state information into a UDP data packet and sends the UDP data packet to the information system simulator;
s2', the communication system simulator splits the received photovoltaic station state information and sends the information to the corresponding communication work station, and the communication work station processes the received data and sends the processed data to the embedded controller;
s3', the embedded controller controls the received photovoltaic station state information, generates a control instruction according to actual needs and sends the control instruction to the communication system simulator;
s4', the communication system simulator distributes the received photovoltaic station control instruction to a communication workstation, and the communication workstation forwards the control instruction to the power system simulator;
and S5 ', the power system simulator transmits the received control command to the corresponding photovoltaic station, adjusts the output of the photovoltaic station, judges whether the simulation is finished or not, and if not, returns to the step S1', loops the step S1 'to the step S5' until the simulation is finished, and stops.
Compared with the prior art, the invention provides a photovoltaic direct current boosting and collecting system-oriented power information digital-analog hybrid simulation platform and a method aiming at the problem that the existing platform adopting direct current boosting, collecting and sending out of a photovoltaic power station can not integrate a power information simulation function and a digital-analog hybrid simulation function, and can accurately simulate the grid-connected characteristic of the photovoltaic direct current boosting and collecting system and test the influence of real physical equipment on a power system; the power system simulator can accurately simulate the output characteristics of the photovoltaic array and the inverter and truly reproduce the working condition of the photovoltaic direct-current station; the method can accurately simulate the condition of the communication system and common communication system faults such as communication blockage, communication system disconnection and network attack; the state information of the photovoltaic direct-current boosting system can be detected, a corresponding control command is generated according to actual control requirements and is issued to the photovoltaic station, and the safe and stable operation of the system is maintained; the method is suitable for testing the performance of real physical equipment and researching the influence of the real equipment on the operation of the power system; the method has the advantages that the real communication environment is simulated, the operation conditions of the power system in different communication environments are analyzed, the influence of the communication conditions on the power system is researched, the limitation that a real object system is limited by practical conditions is overcome, and the simulation capability of the power information physical system is improved.
Drawings
FIG. 1 is a structural framework diagram of a power information digital-analog hybrid simulation platform of the invention facing a photovoltaic direct-current boosting and collecting system;
FIG. 2 is a diagram of physical components of the simulation platform in embodiment 2 of the present invention;
fig. 3 is a diagram of a dc-side voltage waveform of the inverter in embodiment 2 of the present invention;
fig. 4 is a graph of measured values of the inverter output current in embodiment 2 of the present invention;
fig. 5 is a waveform diagram of the active power output from the inverter in embodiment 2 of the present invention.
Detailed Description
The invention will be explained in more detail below with reference to the drawings and examples.
Example 1
A power information digital-analog hybrid simulation platform facing a photovoltaic direct-current boosting and collecting system, as shown in fig. 1, includes a digital-analog hybrid simulation part and a power information simulation part;
the digital-analog hybrid simulation part comprises a power system simulator, a power hardware circuit and a power amplifier, wherein the power system simulator is connected to the power amplifier, the power amplifier is connected with the power hardware circuit, the power hardware circuit comprises a DC-AC converter, a filter, a voltage regulator and a direct current load, the power system simulator comprises a photovoltaic array model, a circuit model, an inverter model, a transformer model, a communication module and an analog input and output module, a photovoltaic station is converged and connected to a direct current bus in a series-parallel mode, and the power system simulator, the power hardware circuit and the power amplifier are all connected through electrical connection;
The power information simulation part consists of a power system simulator, a communication system simulator and an embedded controller, the embedded controller is connected with the communication system simulator, a model in the communication system simulator comprises a photovoltaic station communication workstation model, a communication interface model, a router model and a line model, the embedded controller comprises a data acquisition unit, a state monitoring unit and a control algorithm unit, and data are transmitted among the power system simulator, the communication system simulator and the embedded controller through Ethernet;
the system comprises a power system simulator, an upper computer of the power system simulator and a communication system simulator, wherein the power system simulator, the upper computer of the power system simulator and the communication system simulator are connected to a switch to form a local area network;
real equipment and elements are selected by the AC side power hardware circuit of the photovoltaic DC boosting system, analog quantity signals are transmitted, a control system and an information system are realized in simulation software, and data interaction is carried out in a digital quantity form;
the digital-analog hybrid simulation step further comprises:
s1, the power system simulator simulates a power system model in real time, the photovoltaic stations are connected in a series-parallel connection mode, and the system collects voltage information and transmits analog quantity to the power amplifier through electrical connection;
S2, the power amplifier amplifies the collected voltage signal, connects to the power hardware circuit, and feeds the current signal back to the power system simulator in analog form;
s3, connecting the output voltage of the power amplifier to an alternating current network through a DC-AC two-level converter to realize photovoltaic direct current boosting and grid connection, and simultaneously feeding back a voltage and current signal sampling value after the filter circuit to the power system simulator;
s4, the power system simulator generates a PWM control signal according to the voltage and current sampling signal and outputs the PWM control signal to the DC-AC two-level converter;
the power information hybrid simulation step further comprises:
s1', the power system simulator simulates the power system model in real time, the communication module collects the state information of the photovoltaic station, packages the state information into a UDP data packet and sends the UDP data packet to the information system simulator;
s2', the communication system simulator splits the received photovoltaic station state information and sends the information to the corresponding communication work station, and the communication work station processes the received data and sends the processed data to the embedded controller;
s3', the embedded controller controls the received photovoltaic station state information, generates a control instruction according to actual needs and sends the control instruction to the communication system simulator;
S4', the communication system simulator distributes the received photovoltaic station control instruction to a communication workstation, and the communication workstation forwards the control instruction to the power system simulator;
and S5 ', the power system simulator transmits the received control command to the corresponding photovoltaic station, adjusts the output of the photovoltaic station, judges whether the simulation is finished or not, and if not, returns to the step S1', loops the step S1 'to the step S5' until the simulation is finished, and stops.
Example 2
Fig. 2 shows an example of a simulation platform according to the present invention, as shown in fig. 2, the power amplifier employs an SPS four-quadrant power amplifier, the power system simulator selects an OPAL-RT eMEGAsim simulator, the computer equipped with RT-LAB is used as an upper computer of the power system simulator, the communication system simulator selects an OPNET host, the embedded controller selects a DSP development board whose core device is a TMS320F28377DSP chip, the filter inductance of the filter circuit selects 10mH, and the filter capacitance is 100 μ F.
The specific embodiment is as follows: the method comprises the steps that a photovoltaic direct-current boosting direct-current side real-time simulation model and a control model of a grid-connected inverter are placed in an eMEGAsim simulator to operate, voltage signals of a direct-current side are amplified through a power amplifier by simulation, and the power amplifier output is connected to a power grid through an inverter, a filter and a voltage regulator of a power hardware part in sequence; meanwhile, the eMEGASIM simulator sends the state information to the DSP controller in a digital quantity form through the OPNET host, and the controller sends a control instruction and returns the control instruction to the DSP controller.
The experimental simulation scenario is set as follows: enabling the inverter control at 1 s; when 2s, switching on the photovoltaic grid; the light intensity was changed from 500W/m2 to 300W/m2 at 20s, and from 300W/m2 to 500W/m2 at 40 s.
As shown in fig. 3-5, fig. 3 is a voltage waveform of the dc side of the inverter, and the peak-to-peak value of the phase voltage is about 54V; FIG. 4 is a graph of measured inverter output current values, with the current amplitude increasing to about 5A at 2s, decreasing to about 3A at 20s, and returning to about 5A at 40 s; fig. 5 shows the active power waveform of the inverter output, the output power rises to about 130W at 2s, the output power drops to about 70W at 20s because of the decrease of the light intensity, the light intensity recovers to about 130W because of 40s, and the actual output power of the inverter is slightly less than that of the simulation set value because of the loss generated by the hardware circuit. According to the simulation result, the simulation platform can accurately simulate the operation condition of the photovoltaic direct-current boosting and collecting system, test the grid-connected performance of real equipment and reflect the influence of the communication process on the actual power grid control.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited by the foregoing examples, which are provided to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A power information digital-analog hybrid simulation platform facing a photovoltaic direct-current boosting and collecting system is characterized by comprising a digital-analog hybrid simulation part and a power information simulation part,
the digital-analog hybrid simulation part consists of an electric power system simulator, a power hardware circuit and a power amplifier, wherein the electric power system simulator is connected to the power amplifier, the power amplifier is connected with the power hardware circuit, and the electric power system simulator, the power hardware circuit and the power amplifier are all connected through electrical connection;
the power information simulation part consists of a power system simulator, a communication system simulator and an embedded controller, the embedded controller is connected with the communication system simulator, and data is transmitted among the power system simulator, the communication system simulator and the embedded controller through Ethernet;
the system comprises a switch, a power system simulator, a communication system simulator and a power system simulator, wherein the switch is connected with the power system simulator through the communication system simulator;
the digital-analog hybrid simulation part combines the digital simulation of the power system simulator with the physical simulation of actual equipment and circuits to form a closed-loop test system for detecting the service performance conditions of the actual equipment and the circuits;
The electric power information simulation part carries out coupling simulation on electric power system information flow data and electric power flow data, and influences of communication conditions and control processes on the system are reflected.
2. The photovoltaic direct current boost collection system oriented power information digital-to-analog hybrid simulation platform of claim 1 wherein the power hardware circuit comprises a DC-AC converter, a filter, a voltage regulator and a direct current load;
the power system simulator comprises a photovoltaic array model, a circuit model, an inverter model, a transformer model, a communication module and an analog input/output module, wherein photovoltaic stations are converged and connected to a direct-current bus in a series-parallel connection mode;
the model in the communication system simulator comprises a photovoltaic station communication workstation model, a communication interface model, a router model and a line model;
the embedded controller comprises a data acquisition unit, a state monitoring unit and a control algorithm unit.
3. A power information digital-analog hybrid simulation method for a photovoltaic direct-current boosting and collecting system is characterized by comprising a digital-analog hybrid simulation step and a power information hybrid simulation step,
in the digital-analog hybrid simulation step, a digital signal obtained by a power system simulator is connected to a real grid-connected inverter and a filter circuit through a power amplifier and finally connected to an alternating current power grid, and the digital simulation of the power system simulator is combined with the physical simulation of actual equipment and circuits to form a closed-loop test system;
The power information hybrid simulation step is to simulate the communication condition of an actual power system based on a communication system simulator, simulate an actual photovoltaic station monitoring center by using an embedded controller, access the monitoring center into a power information simulation platform in a ring form by using hardware, simulate the communication and station level control process of a photovoltaic station during actual operation and perform coupling simulation on power system information flow data and power flow data;
the two steps are performed simultaneously.
4. The photovoltaic direct current boost collection system-oriented power information digital-analog hybrid simulation method according to claim 3, wherein the digital-analog hybrid simulation step further comprises:
s1, the power system simulator simulates a power system model in real time, the photovoltaic stations are connected in a series-parallel connection mode, and the system collects voltage information and transmits analog quantity to the power amplifier through electrical connection;
s2, the power amplifier amplifies the collected voltage signal, connects to the power hardware circuit, and feeds the current signal back to the power system simulator in analog form;
s3, connecting the output voltage of the power amplifier to an alternating current network through a DC-AC two-level converter to realize photovoltaic direct current boosting and grid connection, and simultaneously feeding back a voltage and current signal sampling value after the filter circuit to the power system simulator;
And S4, the power system simulator generates a PWM control signal according to the voltage and current sampling signal and outputs the PWM control signal to the DC-AC two-level converter.
5. The power information digital-analog hybrid simulation method for the photovoltaic direct-current boost collecting system according to claim 3 or 4, wherein the power information hybrid simulation step further comprises:
s1', the power system simulator simulates the power system model in real time, the communication module collects the state information of the photovoltaic station, packages the state information into a UDP data packet and sends the UDP data packet to the information system simulator;
s2', the communication system simulator splits the received photovoltaic station state information and sends the information to the corresponding communication work station, and the communication work station processes the received data and sends the processed data to the embedded controller;
s3', the embedded controller controls the received photovoltaic station state information, generates a control instruction according to actual needs and sends the control instruction to the communication system simulator;
s4', the communication system simulator distributes the received photovoltaic station control instruction to a communication workstation, and the communication workstation forwards the control instruction to the power system simulator;
and S5 ', the power system simulator transmits the received control command to the corresponding photovoltaic station, adjusts the output of the photovoltaic station, judges whether the simulation is finished or not, and if not, returns to the step S1', loops the step S1 'to the step S5' until the simulation is finished, and stops.
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